C++ string转换long long

我们用stringstream进行转换

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stringstream: Stream class to operate on strings.存在于头文件sstream中。

#include <iostream>#include <sstream>using namespace std;int main(){    string strLLNum = "1234567890123";    stringstream strIn;    strIn<<strLLnum;    long long llNum;    strIn>>llNum;    cout<<llNum;    return 0;}